Retinal Caustic Optimization for Adaptive Vision Correction
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Solution Overview
Problem
Current methods for determining the required correction of ametropia in the human eye do not adequately account for the eye's physiology, particularly during accommodation, leading to suboptimal vision correction as they neglect the dynamic changes in refractive power and aberration structure.
Innovation Solution
A method that calculates the required optical correction by varying parameters within a search space to optimize the caustic of a light beam at the retina, using wavefront measurements and sub-metrics to determine an overall caustic metric, which ensures improved image quality across different viewing directions and accommodation states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional refraction methods (subjective or objective) are used to determine correction, then the refractive error can be measured, but the correction does not account for dynamic changes in accommodation state and aberration structure
Solution Approach 1:
The patent applies dynamics by measuring wavefront aberrations across multiple accommodation states (e.g., different target distances) and using this dynamic information to determine the optimal correction. Instead of a single static measurement, the system captures how aberration structure changes with accommodation, enabling corrections that adapt to the eye's physiological behavior during viewing.
Solution Approach 2:
The patent changes the parameter being measured from simple refractive error to comprehensive wavefront aberration parameters across multiple accommodation states. By measuring and analyzing higher-order aberrations and their variation with accommodation, the system identifies corrections that optimize retinal image quality across the dynamic range of viewing conditions.
2Manufacturing precision
If full correction of higher-order errors is implemented in spectacle lenses, then vision correction improves for a specific viewing direction, but unacceptable distortions occur outside this correction range
Solution Approach 1:
The patent applies local quality by designing spectacle lenses with spatially varying optical properties that are optimized for specific viewing directions and accommodation states. Rather than uniform correction across the entire lens, the optical correction is tailored to match the local aberration characteristics for different gaze directions, maintaining image quality while avoiding excessive distortion in peripheral areas.
Solution Approach 2:
The patent uses partial action by selectively correcting certain aberration terms while leaving others uncorrected or partially corrected. The system identifies which higher-order aberrations contribute most to retinal image quality degradation and applies correction only to those terms, rather than attempting to correct all measured aberrations, thus avoiding the introduction of new distortions.
3Measurement precision
If subjective refraction is performed under daylight conditions with high-contrast optotypes, then refraction values are optimized for good lighting and high contrast, but the refraction is not suitable for night or twilight vision
Solution Approach 1:
The patent achieves universality by measuring wavefront aberrations under multiple lighting conditions (photopic, mesopic, scotopic) and using this comprehensive data to determine corrections that perform well across all conditions. The resulting spectacle lens or contact lens provides improved retinal image quality both during daytime subjective refraction testing and during nighttime viewing, making the correction universally applicable.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach provides a more comprehensive and adaptive vision correction that enhances image quality and depth of field, reducing fluctuations and improving the visual experience by optimizing the caustic of light beams at the retina, thus addressing the limitations of previous methods.
Implementation Method 1
The objective refraction is determined by determining the wavefront of a propagating light beam
Implementation Method 2
the ametropia of the eye can be approximately corrected by a lens with a toric surface
Implementation Method 3
optimize the caustic of a light beam at the retina
Data Source
Figure 1~2
Figure 3
AI summary
The invention relates to a method for determining the necessary optical correction (2) of the defective vision of an eye (1). According to the invention,the focal area (8) of a light beam (3) passing through the eye (1) is optimized in the region of the retina (6) of the eye (1) by means of optical correction (2). The invention further relates to an apparatus suitable for implementation of the method.